Added print-env, and sampling-request tools
* Updated architecture.md
* In tools/index.ts
- import registerPrintEnvTool and registerSamplingRequestTool
- in registerTools
- call registerPrintEnvTool and registerSamplingRequestTool
* Added tools/print-env.ts
- registers a tool that takes no args and returns the environment variables
* Added tools/sampling-request
- registers a tool that
- takes prompt and maxTokens args
- sends client a sampling request
- returns the client response in the result
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